# Marker gene length

**URL:** <https://forum.biobakery.org/t/marker-gene-length/2884>\
**Category:** MetaPhlAn\
**Created:** [December 10, 2021, 5:22am UTC](https://forum.biobakery.org/t/marker-gene-length/2884 "2021-12-10T05:22:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![saras22](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@saras22](https://forum.biobakery.org/u/saras22)\
**Post date:** [December 10, 2021, 5:22am UTC](https://forum.biobakery.org/t/marker-gene-length/2884/1 "2021-12-10T05:22:49Z")

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Hi @fbeghini  
What is the length of the Clade-specific marker genes in your database in base pairs? I want to know this because I want to keep a minimum read length for all the samples so I should not take a minimum read length that would affect my results.

Thanks  
Saraswati

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**Author:** ![fbeghini](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.biobakery.org/fbeghini/32/81_2.png) [@fbeghini](https://forum.biobakery.org/u/fbeghini)\
**Post date:** [January 6, 2022, 4:02pm UTC](https://forum.biobakery.org/t/marker-gene-length/2884/2 "2022-01-06T16:02:28Z")

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The markers in the database have different lengths. From the bioBakery 3 paper:

> we use the pan-proteome built using the UniRef90 clusters considering all proteins with a length between 150 and 1500 amino acids.

![](https://canada1.discourse-cdn.com/flex027/uploads/biobakery/original/1X/2daeaa8b5f19f0bc209d976c02bd6acb51b00b0a.gif)ᐧ